Improved steam-boiler



ing the same tubes and Water-space as H.

UNITED STATES PATENT OFFICE..

TREAT T. PROSSER, OF FOND DU LAO, WISCONSIN, ASSIGNOR TO HIM- SELF ANDM. O. AND K. A. DARLING, OF SAME PLAGE.

IMPROVED STEAM-BOILER.

Specification forming part of Letters Patent No. 39,530, dated August11, 1&3; antedated January 31, 1863.

To all whom it may concern: Y

Be it known that l, TREAT T. PRossER, of the town and county of Fond duLac, and State of Wisconsin, have invented a new and useful Improvementin Steam-Boilers; and I do hereby declare the following to be a full,clear, and exact description ofthe construction and operation thereof,reference being had to the annexed drawings, making a part of thisspecification, in which- Figure 1 is a perspective View of a tubular orlocomotive boiler with my improvement attached 5 Fig. 2, a longitudinalsection 5 Fig. 3, a cross-section through the firebox; Fig. 4, across-section in the smoke-box; Fig. 5, a cross-section of the boiler,&c., between the fire-box and smoke-box.

The nature of my improvement consists in attaching ajacket to the boilerand tire-box, into which I cause the exhaust-steam of the cylinder to bedischarged, and from which it passes through a portion ofthe tubes, orliuc or fines, to the exhaust-pipe in the smoke-box. I thus cause theexhaust-steam, which heretofore has been allowed to escape as soon as ithas performed its duty in the cylinder, to per` form the additionalfunction of heating in part the water in the boiler.

In the drawings hereto attached I have shown my invention as applied toa tubular or locomotive boiler. By a little modification, however, itcan be equally as well applied to ordinary flue-boilers or otherboilers.

In Fig. l, A shows the chamber formed by the bottom of the boiler andthe jacket a, which, it will be seen, extends from the smoke-box to thechamber A', which latter surrounds the waste-space of the tire-box w w,Figs. Zand 3. In front, and embracing a certain number of the tubes ofthe boiler, there is placed a cap, H, which communicates with thechamber A' by. means of the tubes G, Figs. 2 and 3, and with theaforesaid tubes ofthe boiler.

H' is another cap in the smoke-box, cover- A, in Figs. 4 and 5, showssections of the chamber A in Fig. 2.

B is the junction of the jacket c with the boiler, which should be asnear as possible the water-line of the boiler; G, the steam-chamber 5l), an opening into the chamber A, through which the escape-steam fromthe cylinder is admitted E, the escape-pipe; F, a valve therein, and Kthe chimney or smoke-stack.

A"' is the box formed by the cap H', and becomes thereby also thesteam-box for the exhaust; I, the fire door. By this arrangement it willbe seen that, instead of exhausting the steam from the cylinder directlyinto the exhaust-pipe, as is usually done, I cause it to exhaust intothe chamberA. Vhen cominginto contact with the bottom ofthe boiler, itgives out through italarge portion of its still remain ing heat to thewater therein. From thence this steam passes to and iills up the chamberA', which surrounds the water-space of the lirebox, and then through thepipe G, Figs. 2 and 3, into the chamber A", formed by the cap H, thencethrough the tubes inclosed by this cap to the chamber A"', formed by thecap H', and then through the usual exhaust-pipe, E. The object of thistransit of the exhaust-steam through the tubes in the boiler and causingit to surround the Water-space of the fire-box is the same as thatreferred to in its introduction into chamber A-namely, to absract fromit all the heat possible before allowing it to make its final escape.More or less water of condensation may be produced from thisexhaust-steam, but whatever the amount may be, it will collect in thechamber A', from whence it may be pumped back into the boiler, orallowed to escape. Such tube or iiues as may not be covered by the capsHand H' of course remain open and perform the same function as in boilerswithout my improvement. The cap H has awater-space connected with thewaterspace w of the lire-box.

Having thus fully described my invention, what I claim therein, anddesire to secure by Letters Patent ofthe United States, is-

1. The application of the exhaust-steam of the engine to the boiler, forthe purpose and in the manner set forth.

2. The combination of the chambers A, A', A", and A"' and the inclosedtubes or iiues with the exhaust-pipe or pipes of the engine, in themanner and for the purpose set forth.

T. T. PROSSER.

Witnesses H. KING, DANIEL E. Gnoux.

